test(unit): add unit tests for src/ classes

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Finding

Unit test coverage for core src/ classes is insufficient. Many classes lack dedicated unit tests.

Fix

Add comprehensive unit tests for all public classes in src/Core/ and src/Mod/ directories using Pest syntax.

Acceptance Criteria

• Unit tests for all Helpers classes
• Unit tests for ModuleScanner and ModuleRegistry
• Unit tests for Action trait
• Unit tests for all middleware classes
• Test coverage above 80% for src/Core/
• All tests use Pest syntax

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Parent: #106